Valve mechanism for controlling the operation of two-pressure hydraulic presses



TWO-PRESSURE B. KOCHENDERFER Aug. 18," 1925.

VALVE MECHANISM FOR CONTROLLING THE OPERATION OF HYDRAULIC PRESSES Filed Feb. 16. 1922 3 Sheets-Sheet 1 Aug. 18, 1925. 7 1,549,883

r W; B. KOCHENDERFER VALVE MECHANISM FOR CONTROLLING THE OPERATION OF TWO-PRESSURE AULI DR 0 PRESSES ed Feb. 16. 1922 5 Sheets-Sheet 2' Aug. 18, 1925. I 1,549,883

W.- B. KOCHENDERFER VALVE MECHANISM FOR CONTROLLING THE OPERATION OF TWO-PRESSURE HYDRAULIC PRESSES Filed Feb. 16, 1922 3 Sheets-Sheet 5 PAT vvrnr. n. xocnnnnnnrnn, or

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Application filed February 16, 1922; Serial No. 536,946. I

To all whom it may concern:

Be it known that 1, lVILLIAM B. Kocnnnnnnrnma citizen of the United States, and

a resident of Camden, Camden County, New

Jersey, have invented certain new and use-- tul Improvements in Valve Mechanism for Controlling the Operation otTwo-Pressure Hydraulic Presses, of which the following is a specification.

of valves for controlling pressure passing to'the cylinder (or cylinders) of a hydraulic .press, wherein the initial operation of the platen is effected by-low pressure fluid, and

matically supplied for the final'operation of the press.

One object myinvention is to provide asyst-em with a single, manually-controlled, valve; the same being moved by a suitable lever to open position or to a position where-- in low pressure will be admitted to the cylinder or cylinders ofthe hydraulic press; the

under the control of automatically controlled valves whereby pressure may build tip in an intensifier through the medium of which high pressure is introduced into the press cylinder. In addition, .my arrangement in cludes means whereby such high pressure passes to the press cylinders from the intensifier without having to pass througha valve-controlled passage. V

' These and other features of my invention are morefully described hereinafter, refer- Fig. 4 is a sectional elevation, largely dia-' ,grammatic, of a controlling valve which 'll may employ with my improved construe tion, and

Fig. 5, is a sectional elevation, largely diagrammatic, of an automatic three-way valve which I may employ. l

lln Fig. 1, of the drawings, 1 may represent. a press frame having the usual-platen My invention relates to the arrangement when this builds up, high pressure is auto' subsequent application of pressure beingence being had to the accompanying draw:

2, and in the present instance the platen is shown as arranged for movement by pistons or plungers, disposed in a'pair of cylinders 3 and 4, to which motive fluid may be admitted simultaneously via pipes 5 and 5 from a common connection 6, after passing a check valve)? in the line to which said connection 6 is attached. The platen is arranged to carry work which maybe raised into contact with a fixed abutment or stop 8, disposed in the upper part of the press. It will be understood, of course, that the principles involved in my present arrangement or construction may be applied to single cylinder hydraulic presses, or to presses having more than two cylinders.

The casing of a manually-controlled valve is indicated at 10; a sectional view of such valve structure, largely diagrammatic, being clearly illustrated in Fig. 4. When this valve, indicated at 10 is opened to the line pressure, which may be eflected by. move ment of an operating lever 11, (connected to said valve 10 by a stem 11) in the direction of the arrow a, low pressure from a source of supply may enter said valve casing 10, from a main A, via pipe A, pas sing thencet-hrough a pipe B to the casing 7, of the check valve 7, and entering said casing 7 through an opening 12. The valve'lO has end portions 10 and 10, which control the inlet and exhaust to and from pipes B and F, said pipes when open to exhaust communicating with a pipe G connected to the exhaust line; movement of the valve 10, ,in the direction of the arrow a, permitting exhaust from F to G, andmovement of said valve in the direction of the arrow 02, permitting exhaust fromB to Gr. The low pressurepassing through pipe B raises the check valve Tagainst the tension of a spring 13, and passes to an outlet 14:, leading to the connection 6, and thence to the pipes 5 and 5,- communicating with the cylinders 3 and 4; such pressure raising the pistons orv 'plungerstherein until the platen 2 carries the work into contact with the abutment or stop 8. J

In order to provide the necessary high pressure to complete the operation ofthe press, 1 provide an intensifier 15, which may be of any usual type and in the present instance comprises a fixed ram 16, properly mounted in a suitable frame 17, and fitting a hollow piston or plunger 18, containing t ed with the line B by a pipe D; the line B being provided with a T-connection 21 from which said pipe D leads in advance of the connection with the check valve casing 7 and as the low pressure 'builds up in the cylinders 3 and 4, a sufficient quantity is by-passed through pipe D and entering the valve casing 20, acts against the-larger end of the floating valve contained therein and overcomes the pressure from the main A tending to lift said valve and hold it in the closed position to cut off flow to the pipe C. When this floating valve is shifted, pressure from the main A may flow through the valve casing 20, to the pipe C and thence to the cylinder 19 of the intensifier; lifting the piston or plunger 18, therein and forcing the fluid within said piston or plunger into the ram 16 and out through a pipe E to the check valve casing 7*; such pressure entering the check valve casing at the point 22, beyond the check valve 7, and passing'through the outlet 14,

of said casing to the connection 6, and thence to the pipe 5 and 5 leading to the cylinders 3 and 4; the check valve 7 meanwhile closlng under the action of the spring 13 before the high pressure fluid begins to flow.

The intensifier may be of any usual type, comprising a hollow piston or plunger normally filled with liquid, or which fills with liquid exhausing from the cylinders 3 and 4:, and the high pressure effected by the intensifier, due to the movement of the piston or plunger 18, in the manner common to the structures of this type, forces the fluid under1 steadily increasing pressure into the pipe E and delivers the same through the check valve casing 7*, without passing the check valve, to the connection 6 communicating with the twin delivery pipes 5 and 5 When it is desired to release the pressure, the lever 11 connected to the valve within the casinglO, is moved in the direction of the arrow :12, whereupon pressure may pass from the Valve casing 10 via pipe F to a cylinder 23 carried by .the check valve casing 7, as shown in Fig. 3, and operate a piston 24 therein the latter having a stem 25, which, when moved by the piston 24, engages the check valve 7 and opens the same against the tension ofthe spring 13; permitting fluid to pass from the cylinders 3 and 4, via the twin delivery pipes 5 and 5 tothe connection 6, through outlet 11 and past the check valve 7, thence to the pipe B, valve casing 10, and pipe G to'the exhaust line H. At the same time the pressure will exhaust from the valve casing 20 through the pipe D to pipe B permitting the automatic valve 20 in said casing 20 to shift under the influence of pressure from the operation of the intensifier supplying the high pressure to the press cylinders being wholly automatic and not depending upon the operator for its proper and effective control. It will also be understood that the intensifier will be of a capacity that will supply the desired amount of high pressure for any work within the capacity of the press.

I claim:

1. In mechanism for controlling the admission of high and low pressure to the cylinder of an hydraulic press, the combination of a supply main, a manually-operated valve controlling delivery from said main to the press cylinder, at check valve'th'rough which such pressure passes to said cylinder, an-

automatic valve operated after low pressure in the press cylinder builds up; pressure to actuate said automatic valve being tapped from the low pressure line in advance of the check valve, an intensifier receiving low pressure directly from the main through said automatic valve after the latter has been actuated, and means for delivering the high pressure developed by such intensifier to the press cylinder around the check valve through the same connection admitting low pressure to said cylinder from the manually-operated valve.

2. In mechani'sm for controlling the admission of high and low pressure to the cylinder of an hydraulic press, the combination of a supply main, a manually-operated valve controlling delivery from said main to the press cylinder. a spring-controlled check valve through which such pressure passes to said cylinder, a valve automatically operated after low pressure in the press cylinder builds up; pressure to actuate said automatic valve being tapped from the low pressure line in advance of the check valve, an intensifier receiving low pressure directly from the main through said automatic valve after the latter has been actuated, means for-delivering the high pressure developed by such intensifier to the press cylinder around the check valve through the same connection admitting low pressure to said cylinder from the manually-operated valve,

and blind pressure means for operating the check Valve to exhaust the cylinder; said means being brought into action by reversing the position of the manually-controlled valve. v r

3. In valve mechanism for controlling the admission of high and low pressure to the cylinder of an hydraulic press, the combination of a supply main, a manually-controlled valve connected thereto, a system of piping a cylinder;

disposed between said valve and the'press said system initially conveying low pressure fluid to the press cylinder via a checkvalve, an automatic valve disposed in the low pressure line and normally closed, means for by-passing the low pressure from a point in advance of the check valve after the pressure in the cylinder builds up' to shift said automatic valve whereby low pressure may pass to an intensifier, and means for delivering high pressure developed by such intensifier around the movable element of the check valve.

4. In valve mechanism for controlling the admission of high and low pressure to the cylinder of an hydraulic press, the combination of a supply main conveying low pressure, a line for conveying such low pressure fromthe main to the cylinder, a manually-controlled valve for placing said main and the cylinder line in communication, a check valve in said line through which said pressure passes to the cylinder, an intensifier for developing high pressure fromthe low pressure line, a line conveying low pressure from the manually-controlled valve to the intensifier, an automatically operating twopressure floating valve controlling the pas sage of such pressure to the intensifier and exhaust therefrom, and a by-pass for conveying low pressure from a point in advance of the check valve to actuate the twopressure floating valve; said valve when so shifted admitting low pressure to the intensifier and causing it to deliver high pressure to the cylinder around the check valve.

sure to actuate said automatic valve bei'ng'tapped from the low I specification.

5. In mechanism for controlling the admission of high and low pressure to the cylinder of hydraulic presses, the combination of a source of supply, a manuallycontrolled valve admitting the same to the pipe system, means for delivering the pressure to the cylinder of the press, a check valve through which such pressure passes, an automatic valve operated after low pressure in the press cylinder builds up; presbeing tapped from the low pressure pipe in advance of the check valve, an intensifier receiving low pressure directly from the main after said automatic valve is actuated, means for delivering the high pressure developed by such intensifier to the press cylinder around the check valve through the same connection admitting low pressure to said cylinder, means for directing pressure from said manually-controlled valve to shift the check valve and open the cylinders to exhaust, and a piston and piston rod for contacting with the check valve to open the same; sh fting of the manually-controlled valve opening the casing of the automatic valve to exhaust whereby the latter may shift and open the intensifier to exhaust.

6. In mechanism for controlling the admission of high and low pressure tothe cylinder of an hydraulic press, the combination of a supply main, a manually-operated valve controlling delivery from said main to the press cylinder, a check valve through which such pressure passes to said cylinder, an automatic valve operated after, low pressure in the press cylinder builds up; pressure, to actuate said automatic valve pressure line, an intensifier receiving low pressure directly from the main through said automatic valve after the latter has been actuated, and means for delivering the high pressure developed by such intensifier to the press cyl-- inder through the same connection admitting low pressure to said cylinder from the manually-operated valve.. In Witness whereof WM. B. KOCHENDERFER.

I have signed this 

